"Whether selling services or goods, sellers don't have to change a thing, except potentially expecting new trailblazing customers and more sales."

When shoppers choose to buy things with bitcoin, a new Bitcoin address is generated and attached to the order. Buyers can use either mobile or hosted Bitcoin wallets.

Sellers, however, don't have to worry about receiving payment in bitcoin since they will be credited with the U.S. dollars quoted in the sale, and not with the cryptocurrency.

That way, sellers won't be exposed to risk from the volatility in the price of bitcoin, which recently dropped below US$500 amid speculation that China may prohibit banks working with Bitcoin exchanges.

Square is known for its magnetic-stripe reader that lets sellers take credit-card payments by smartphone, but has branched out to cover other payment areas. Last fall it launched Square Cash, which lets users send money via email. A recently added feature helps users collect payments from debtors.

Square is the latest e-commerce company to show interest in Bitcoin. Last week, San Francisco-based mobile payments startup Stripe announced it is experimenting with Bitcoin support, adding the digital currency as a payment option for online backup services firm Tarsnap.

Overstock, which had revenues of $1.3 billion in 2013, said on March 4 that it was surprised to have already topped $1 million in Bitcoin sales. It logged more than 4,300 Bitcoin customers and said it believes nearly 60 percent were new to Overstock.